Aegognathus dulima Cáceres, Ríos-Málaver & Grossi,, 2019

Ríos-Málaver, Juan Sebastián Dueñas Cáceres ı Cristóbal & Grossi, Paschoal Coelho, 2019, Taxonomic contribution on the Andean species of Aegognathus (Coleoptera: Lucanidae) with two new species from Colombia and Peru, Journal of Natural History 53 (35), pp. 2145-2164 : 2150-2151

Aegognathus dulima Cáceres, Ríos-Málaver & Grossi, new species

( Figs. 1B ; 4 B, D; 5B)

Holotype male labelled: Colômbia, Tolima, Ibagué, Termales el Rancho, Cañon del Río Combeima, 31.viii.2014, 04° 36 ʹ 57.64 ” N; 075° 20 ʹ 15.45 ” W, 2987 m, luminosa – Y. Gutiérrez & I. C. Ríos-Málaver. 13 ( CERPE)

Diagnosis. Body black, with distinct bluish and reddish reflections. Head setose along the anterior margin. Eyes slightly emarginate; mandibles dorsally carinate at the base, wavy internally, with a subtriangular median tooth and two rounded basal teeth. Three longitudinal costae over the elytra. Abdominal ventrites with yellowish setae, especially along ventrite V; Ventrite I-IV with wrinkled lateral margins. Genitalia small when compared with other Aegognathus species, with a short and flat everted sac.

Description Holotype ( Figure 1B ) Male. Size: Total Length. 12.5 mm. Total Width. 4.4 mm Colour: Head black; pronotum mainly black, with dark-red spots over sides, and blue reflections along median groove; elytra bluish to somewhat purple, with reddish longitudinal lines. Venter almost entirely black, mentum, trochanters and coxae, with dark-red tones. Head: form transverse. Surface shagreened, apparently smooth, with small yellowish setae. Anterior margin emarginate, with an interrupted line of yellowish setae; ocular canthus only reaching the first half of eye. Temporal process reduced. Mandibles as long as head and first third of pronotum, strongly incurved, with a dorsal carina at base; wavy internal face, with two rounded basal teeth, and a median subtriangular acute tooth, apex concave. Antennae 10 segmented, lamellae with yellowish setae over distal region. Pronotum: Surface shagreened; anterior angles slightly rounded. Border complete, except for the median region over posterior margin, with a continuous band of yellowish setae along anterior and posterior margins. Disc with a longitudinal groove. Elytra: Longitudinal costae distinct, one along suture, and two near the posterior edge but not reaching it; surface with large punctures, dense, with small yellowish simple setae, getting more distinct and erect posteriorly; epipleuron strongly and uniformly punctate, punctures coarse, with yellowish and erect to curved setae. Legs: Protibiae externally serrate, with several teeth along margin, increasing in size distally, inner margin with one apical tooth and one spur. Mesotibiae with three external median teeth, increasing in size distally; apex with four apical teeth and two spurs. Metatibiae with one external median tooth; apex as mesotibiae. Venter: Mentum trapezoidal, transverse, with a transverse groove, moderately punctate, with small yellowish appressed setae. Gena punctate with a posterior carina, densely punctate, with yellowish setae especially along prosternum. Prosternum with two continuous bands of setae along anterior and posterior margins. Mesoventrite with a group of setae densely distributed posteriorly. Metaventrite punctate, with yellowish appressed setae. Discrimen present as a continuous suture, ending into a longitudinal posterior groove. Abdominal ventrites with yellowish setae, especially along ventrite V; Ventrite I-IV with wrinkled lateral margins. Punctures moderate to coarse and somewhat dense. Genitalia ( Figure A4 (b,d)): Aedeagus symmetric, rounded proximally, slightly divergent distally. Basal piece subtriangular; 2.0 times longer than parameres; Median lobe almost cylindrical, with slightly concave lateral margins; sides setose; cross bar ‘ X ’ shaped, on dorsal view with broader lobes over posterior portion ( Figure A5 (b)). Parameres in ventral view, with inner margins slightly convex; almost straight on lateral view slightly rounded distally with an almost truncate posterior margin, setose. Internal sac 2.6 shorter than parameres and basal piece length together, poorly sclerotised; wider proximally, narrower distally with two strap like sclerites joined at apical third, narrower distally, with a cylindrical projection until the gonopore.

Female. Unknown.

Epithet

the specific epithet makes allusion to the ancestral name of ‘ El nevado del Tolima ’ volcano, where the specimen was collected. ‘Dulima’ is the name that was given to this mountain by the ‘ Pijao, ’ an indigenous group that inhabited the region in the pre- Columbian period. The name represents the goddess from the snow-covered peaks that protected the indigenous group, it is used here, as a noun in apposition.

Distribution. Northern Central Cordillera of Colombia, Páramo province ( Morrone 2015)

Remarks. According to the original description made by Van De Poll (1886), Agognathus leuthneri was the first species described from Colombia, however, the current infomartion places this species in Equador, making A. dulima the first species described for Colombia. The specimen presents unique characteristics such as the dorsal carina present at the base of mandibles, internal face of mandibles wavy, and the particularly small genitalia when compared with other members of the genus, showing a short and flat everted internal sac that lacks pigmentation.

Figures

Figure A1. (a) Aegognathus waterhousei, Holotype male in dorsal view. (b) Aegognathus dulima, holotype male in dorsal view. Scale bar 5 mm

Figure A4. Male genitalia. (a) Aegognathus waterhousei ventral view. (b) Aegognathus dulima n.sp. ventral view. (c) A. waterhousei lateral view. (d) A. dulima n.sp. lateral view. Scale bar 1 mm.

Figure A5. Cross bar struts dorsal view. (a) A. waterhousei. (b) A. dulima n.sp. Scale bar 1 mm.